US9695859B2 - Fastening bolt for use in concrete - Google Patents

Fastening bolt for use in concrete Download PDF

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Publication number
US9695859B2
US9695859B2 US14/696,597 US201514696597A US9695859B2 US 9695859 B2 US9695859 B2 US 9695859B2 US 201514696597 A US201514696597 A US 201514696597A US 9695859 B2 US9695859 B2 US 9695859B2
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Prior art keywords
threads
shaft
angle
concrete
head
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US14/696,597
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English (en)
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US20160032956A1 (en
Inventor
Cheng-Yen Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
King Point Enterprise Co Ltd
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King Point Enterprise Co Ltd
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Assigned to KING POINT ENTERPRISE CO., LTD. reassignment KING POINT ENTERPRISE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WU, CHENG-YEN
Publication of US20160032956A1 publication Critical patent/US20160032956A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0052—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge having indentations, notches or the like in order to improve the cutting behaviour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis

Definitions

  • This invention relates to a fastener and relates particularly to a fastening bolt for use in the concrete.
  • a conventional concrete bolt 1 comprises a head 11 , a shaft 12 connected to the head 11 , a drilling portion 13 disposed at a distal end of the shaft 12 and a plurality of threads 14 spirally disposed on the shaft 12 .
  • a screwing operation of the concrete bolt 1 is executed by using an electric drill (not shown) to drill a pilot hole 21 in a concrete wall 2 in advance and then inserting the concrete bolt 1 into the hole 21 for engaging the concrete wall 2 .
  • This conventional structure still has problems.
  • the concrete bolt 1 usually has symmetrical threads 14 .
  • an upper flank surface and a lower flank surface of each thread 14 have the same inclined angle relative to a normal line passing an edge where the two surfaces meet, so the flank surfaces has a small gradient because of the symmetrical design.
  • the flank surfaces of the threads 14 having the small gradient come into contact with the concrete wall 2 and cause some of the threads 14 close to the drilling portion 13 an over-large and incessantly-created frictional resistance.
  • a user may impart more rotating force to overcome the resistance, but it takes time and effort to drill. Further, if more torque is exerted to force the threads 14 to enter the wall 2 , the shaft 12 easily swings or enters aslant at the beginning of the drilling action.
  • An object of this invention is to provide a fastening bolt for use in concrete which attains a quick drilling operation and resists the drilling resistance effectively to provide preferable mechanical properties.
  • the fastening bolt also achieves a better fastening and positioning effect after the drilling operation.
  • the fastening bolt of this invention includes a shaft, a head disposed on a first end of the shaft, a drilling portion formed on a second end of the shaft opposite to the first end, a plurality of first threads spirally disposed on the shaft and a plurality of second threads spirally disposed between the first threads.
  • An outer diameter of the second threads is smaller than that of the first threads.
  • Each first thread has a leading surface facing the drilling portion and a trailing surface facing the head. The leading surface and the trailing surface converge on a thread ridge.
  • Each first thread defines a line perpendicular to a central axis of the shaft, and the line passes the thread ridge.
  • the leading surface is inclined to the line at a leading angle
  • the trailing surface is inclined to the line at a trailing angle.
  • the trailing angle is smaller than the leading angle so that each first thread can be formed into an asymmetrical design.
  • Some of the first threads close to the drilling portion have a plurality of cutting grooves formed thereon. Each cutting groove is formed by walls with different lengths. Each cutting groove is opened at an angle which can be less than or equal to 90 degrees.
  • the cutting grooves are preferably opened in a direction opposite to a screwing direction of the shaft.
  • Some of the second threads close to the drilling portion also have a plurality of recesses formed thereon.
  • the cutting grooves and recesses formed on part of the first and the second threads near the drilling portion can help break a wall of the workpiece quickly.
  • the trailing surface and the leading surface of each first thread with different inclined angles allow the bolt to fight against the drilling resistance and enter the workpiece with no resistance, thereby attaining a rapid drilling and entering effect.
  • the subject thread structure also prevents the shaft from drilling aslant to attain a firm engagement between the bolt and the workpiece and enhance the fastening effect.
  • the trailing angle ranges from 18 degrees to 28 degrees, and the leading angle ranges from 37 degrees to 47 degrees so that each first thread can be arranged asymmetrically.
  • each recess of the second thread can also be formed by support walls with different lengths and opened at an included angle which is not over 90 degrees.
  • the recesses are opened in a direction opposite to the screwing direction.
  • the shaft can be made of two materials.
  • the shaft has an anti-rust section made of stainless steel and a hardened section made of carbon steel.
  • the anti-rust section extends downwards from the head.
  • the hardened section follows the anti-rust section and extends to the drilling portion.
  • FIG. 1 is a schematic view showing a conventional concrete bolt
  • FIG. 2 is a schematic view showing a first preferred embodiment of this invention
  • FIG. 2A is an enlarged view of FIG. 2 ;
  • FIG. 3 is a cross-sectional view showing the first preferred embodiment as seen along the line e-e of FIG. 2 ;
  • FIG. 4 is a cross-sectional view showing the first preferred embodiment as seen along the line f-f of FIG. 2 ;
  • FIG. 5 is a schematic view showing the first preferred embodiment in use.
  • a fastening bolt 3 for use in concrete of the first preferred embodiment includes a shaft 31 defining a central axis X, a head 32 disposed on a first end of the shaft 31 , a drilling portion 33 formed on a second end of the shaft 31 opposite to the first end, a plurality of first threads 34 , 34 ′ spirally disposed on the shaft 31 and extending from the drilling portion 33 toward the head 32 , and a plurality of second threads 35 , 35 ′ spirally disposed between the first threads 34 , 34 ′. Also referring to FIG.
  • each of the first threads 34 , 34 ′ has a trailing surface 341 facing the head 32 and a leading surface 342 facing the drilling portion 33 .
  • the leading surface 342 and the trailing surface 341 converge on a thread ridge 343 .
  • a line N perpendicular to the central axis X of the shaft 31 is defined to pass the thread ridge 343 .
  • the leading surface 342 and the trailing surface 341 are respectively orientated at respective angles. In other words, the leading surface 342 is inclined with respect to the line N by a leading angle a 2 .
  • the trailing surface 341 is inclined with respect to the line N by a trailing angle a 1 .
  • the trailing angle a 1 is smaller than the leading angle a 2 to provide an asymmetrical thread design.
  • the trailing angle a 1 is set between 18 degrees and 28 degrees
  • the leading angle a 2 is set between 37 degrees and 47 degrees.
  • some of the first threads close to the drilling portion 33 as depicted by the numeral 34 ′, have a plurality of cutting grooves 344 formed thereon.
  • Each cutting groove 344 shown in FIG. 3 , is formed by walls 345 having different lengths, thereby being in an asymmetrical form.
  • the cutting groove 344 is opened at an angle ⁇ which does not exceed 90 degrees.
  • the angle ⁇ can be less than or equal to 90 degrees.
  • the cutting grooves 344 of each first thread 34 ′ are opened in a direction opposite to a screwing direction S of the shaft 31 of FIG. 2 to attain a quick breaking effect and provide a firm engagement for an anti-loosening effect.
  • An outer diameter r 2 of the second threads 35 , 35 ′ is smaller than an outer diameter r 1 of the first threads 34 , 34 ′, thereby helping reduce the resistance during the operation and entering quickly.
  • Some of the second threads close to the drilling portion 33 as depicted by the numeral 35 ′, have a plurality of recesses 351 formed thereon.
  • Each of the recesses 351 is formed by support walls 352 with different lengths and opened at an included angle ⁇ which is not over 90 degrees.
  • the recesses 351 are also opened in a direction opposite to the screwing direction S as described above.
  • the bolt 3 can break the workpiece quickly with the aid of cutting grooves 344 and recesses 351 .
  • the shaft 31 is preferably made of two materials, such as an anti-rust section 31 A made of stainless steel which extends downwards from the head 32 by a certain length and a hardened section 31 B made of carbon steel which extends from the anti-rust section 31 A to the drilling portion 33 .
  • This hardened section 31 B with higher hardness assists the drilling portion 33 in drilling and entering quickly.
  • the anti-rust section 31 B exposed to the outside helps keep the shaft 31 from rusting and corroding in order to attain a good appearance of use.
  • the head 32 is rotated by a driver tool (not shown) to impart a rotating torque to the shaft 31 which drives the drilling portion 33 to enter a workpiece 4 , such as a concrete wall 4 .
  • a driver tool (not shown) to impart a rotating torque to the shaft 31 which drives the drilling portion 33 to enter a workpiece 4 , such as a concrete wall 4 .
  • Those first threads 34 ′ and second threads 35 ′ close to the drilling portion 33 are concurrently rotated and gradually drilled into an interior of the wall 4 , namely an inner wall of a pre-drilled pilot hole of the concrete.
  • the cutting grooves 344 of the first threads 34 ′ alternate with the recesses 351 of the second threads 35 ′ to help break the wall 4 quickly at the beginning of the drilling action.
  • the second threads 35 ′ with the smaller outer diameter r 2 enters the hole quickly by following the first threads 36 ′ with the larger outer diameter r 1 , thereby reducing the drilling resistance.
  • Debris, small pieces of the wall 4 broken by the drilling and breaking action can be introduced into the cutting grooves 344 and the recesses 351 and then be pushed to move along the spiral or helical direction of the first threads 34 ′ and the second threads 35 ′.
  • the opening direction of the cutting grooves 344 and the recesses 351 allows part of the debris to be stored therein.
  • the first threads 34 ′ maintain a vertical entry into the wall 4 and prevent the shaft 31 subjected to the rotating torque and the drilling resistance from drilling aslant. Therefore, the beginning of the drilling action is stable and quick.
  • the remaining first threads 34 and second threads 35 far from the drilling portion 33 , keep entering along a drilling track formed by those cutting grooves 344 and recesses 351 . Thus, the drilling speed is increased.
  • the bolt 3 attains a quick drilling speed and preferable mechanical properties, such as anti-torque characteristic and tensile strength, prevents the shaft 31 from entering aslant and attains a better fastening effect to enhance the engagement between the bolt 3 and the wall 4 .
  • the fastening bolt for use in concrete takes advantage of cutting grooves and recesses respectively defined on some of the alternating first and second threads near the drilling portion to help break the wall of the workpiece quickly.
  • the asymmetrical configuration of each first thread and the alternating first and second threads with different outer diameters allow the shaft to enter the workpiece smoothly, and quickly, thereby providing a quick drilling speed and preferable mechanical properties, such as anti-torque characteristic and tension strength.
  • the claimed structure also prevents the shaft from drilling aslant in order to attain a better fastening effect and enhance the engagement between the bolt and the workpiece.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
  • Joining Of Building Structures In Genera (AREA)
US14/696,597 2014-07-31 2015-04-27 Fastening bolt for use in concrete Active 2035-09-04 US9695859B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
TW103213571U TWM489214U (en) 2014-07-31 2014-07-31 Cement expansion bolt
TW103213571U 2014-07-31
TW103213571 2014-07-31

Publications (2)

Publication Number Publication Date
US20160032956A1 US20160032956A1 (en) 2016-02-04
US9695859B2 true US9695859B2 (en) 2017-07-04

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Country Status (8)

Country Link
US (1) US9695859B2 (pl)
EP (1) EP2980424B1 (pl)
CN (1) CN204664098U (pl)
DK (1) DK2980424T3 (pl)
ES (1) ES2634671T3 (pl)
HU (1) HUE033022T2 (pl)
PL (1) PL2980424T3 (pl)
TW (1) TWM489214U (pl)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180335068A1 (en) * 2015-11-19 2018-11-22 Baier & Michels Gmbh & Co. Kg Thread-forming or self-tapping screw, in particular for use in light metal
EP3686445A1 (en) * 2019-01-24 2020-07-29 Kuo-Tai Hsu Concrete screw
US11754110B2 (en) 2018-06-21 2023-09-12 Ejot Gmbh & Co. Kg Self-tapping screw
US20230392636A1 (en) * 2021-04-30 2023-12-07 Simpson Strong-Tie Company Inc. Concrete fastener

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CN106917510A (zh) * 2015-12-25 2017-07-04 世铠精密股份有限公司 螺纹式植筋装置及其成型方法
CN106917472A (zh) * 2015-12-25 2017-07-04 世铠精密股份有限公司 螺纹式植筋装置及其成型方法
US10570943B2 (en) * 2016-11-16 2020-02-25 Illinois Tool Works Inc. Threaded fastener
CN110462547B (zh) * 2017-02-23 2023-05-30 福马有限公司 流量调节器
CN107246433A (zh) * 2017-08-08 2017-10-13 舟山北化聚合物加工技术研究所有限责任公司 合金螺杆
USD875514S1 (en) * 2018-01-15 2020-02-18 Ningbo Anchor Fasteners Industrial Co., Ltd. Concrete screw with ring groove
CN111936279A (zh) * 2018-04-09 2020-11-13 希尔曼集团股份有限公司 用于混凝土和抗飓风应用的螺旋式紧固件
US10801539B2 (en) * 2018-09-20 2020-10-13 Taiwan Shan Yin International Co., Ltd. Screw capable of reducing drilling torque
EP3757316A1 (en) * 2019-06-27 2020-12-30 Hilti Aktiengesellschaft Concrete screw with integrated washer with bulging underhead surface
US12473942B2 (en) 2021-03-30 2025-11-18 The Hillman Group, Inc. Wood screw
CN114001081A (zh) * 2021-11-10 2022-02-01 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 一种防咬死型不锈钢螺栓及其制造方法
USD1115031S1 (en) * 2022-09-08 2026-02-24 Mirus Llc Locking screw
USD1106810S1 (en) 2022-09-29 2025-12-23 The Hillman Group, Inc. Screw
EP4467823A1 (en) 2023-05-26 2024-11-27 Hilti Aktiengesellschaft Screw comprising root and crest serrations
USD1116789S1 (en) 2023-06-02 2026-03-10 The Hillman Group, Inc. Screw
USD1115507S1 (en) 2023-06-02 2026-03-03 The Hillman Group, Inc. Screw

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US1465148A (en) * 1917-01-18 1923-08-14 Rosenberg Heyman Screw
US4652194A (en) * 1984-11-26 1987-03-24 Fujibyora Co., Ltd. Anchor bolt
US6086303A (en) * 1996-01-18 2000-07-11 Flueckiger; Werner Distance screw
US6152666A (en) * 1998-04-03 2000-11-28 Uli Walther Screw for use as a fastener in fibrous material such as wood
US6322307B1 (en) * 1997-07-26 2001-11-27 Unifix Limited Fixing anchor
US20060285940A1 (en) * 2005-06-16 2006-12-21 Mirco Walther Screw For Use In Concrete
US20110014007A1 (en) * 2009-07-20 2011-01-20 Powers Fasteners, Inc. Masonry anchor
US20110188966A1 (en) * 2010-01-29 2011-08-04 Ching-Cheng Tsai Fastening screw bolt
US8348571B2 (en) * 2009-11-06 2013-01-08 Bi-Mirth Corp. Screw
US20130336744A1 (en) * 2012-06-15 2013-12-19 Infastech Intellectual Properties Pte. Ltd. Threaded masonry fastener
US8944734B2 (en) * 2007-12-28 2015-02-03 Taiwan Shan Yin Int'l Co., Ltd. Bimate screw

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DK2501944T3 (en) * 2009-11-18 2015-01-26 Simpson Strong Tie Co Inc Fixed element with hardened threads

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US1465148A (en) * 1917-01-18 1923-08-14 Rosenberg Heyman Screw
US4652194A (en) * 1984-11-26 1987-03-24 Fujibyora Co., Ltd. Anchor bolt
US6086303A (en) * 1996-01-18 2000-07-11 Flueckiger; Werner Distance screw
US6322307B1 (en) * 1997-07-26 2001-11-27 Unifix Limited Fixing anchor
US6152666A (en) * 1998-04-03 2000-11-28 Uli Walther Screw for use as a fastener in fibrous material such as wood
US20060285940A1 (en) * 2005-06-16 2006-12-21 Mirco Walther Screw For Use In Concrete
US8944734B2 (en) * 2007-12-28 2015-02-03 Taiwan Shan Yin Int'l Co., Ltd. Bimate screw
US20110014007A1 (en) * 2009-07-20 2011-01-20 Powers Fasteners, Inc. Masonry anchor
US8348571B2 (en) * 2009-11-06 2013-01-08 Bi-Mirth Corp. Screw
US20110188966A1 (en) * 2010-01-29 2011-08-04 Ching-Cheng Tsai Fastening screw bolt
US20130336744A1 (en) * 2012-06-15 2013-12-19 Infastech Intellectual Properties Pte. Ltd. Threaded masonry fastener

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180335068A1 (en) * 2015-11-19 2018-11-22 Baier & Michels Gmbh & Co. Kg Thread-forming or self-tapping screw, in particular for use in light metal
US11703074B2 (en) * 2015-11-19 2023-07-18 Baier & Michels Gmbh & Co. Kg Thread-forming or self-tapping screw, in particular for use in light metal
US11754110B2 (en) 2018-06-21 2023-09-12 Ejot Gmbh & Co. Kg Self-tapping screw
EP3686445A1 (en) * 2019-01-24 2020-07-29 Kuo-Tai Hsu Concrete screw
US20230392636A1 (en) * 2021-04-30 2023-12-07 Simpson Strong-Tie Company Inc. Concrete fastener

Also Published As

Publication number Publication date
EP2980424A1 (en) 2016-02-03
CN204664098U (zh) 2015-09-23
ES2634671T3 (es) 2017-09-28
PL2980424T3 (pl) 2017-09-29
DK2980424T3 (en) 2017-08-21
HUE033022T2 (en) 2017-11-28
US20160032956A1 (en) 2016-02-04
TWM489214U (en) 2014-11-01
EP2980424B1 (en) 2017-05-03

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